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The data given below are for the adsorption of nitrogen on alumina at 77.3 K. Show that they fit in a BET isotherm in the range of adsorption and find Vmono and hence surface area of alumina (m2 g-1). At 77.3 K, saturation pressure, P* = 733.59 torr. The volumes are corrected to STP and refer to 1 g of alumina. The area occupied by a nitrogen molecule at -195 °C estimated to be 16.2
x 10-20 m2.
| 
 P/ (torr)  | 
 37.67  | 
 74.20  | 
 114.54  | 
 142.0  | 
 185.34  | 
| 
 V (cm3 g-1: STP)  | 
 23.14  | 
 28.1  | 
 33.1  | 
 36.35  | 
 41.49  |